Unusuropode castroi Duarte & Santos, 1962
Cretaceous
Gara Sbaa Member, Akrabou Formation
Gara Sbaa, Morocco

11mm negative marine isopod

Crustacean,

Isopods are uncommon in the fossil record, dating back to the Carboniferous Period – first-known from the Mazon Creek fauna.  Biologists have studied modern ones the size of a lobster from the depths of the ocean.  Most are small like the “pill bugs” you found in your grandparents’ garden.